/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.runtime.operators.coordination;

import org.apache.flink.runtime.jobgraph.OperatorID;

import java.util.Collection;
import java.util.stream.Collectors;

/** An interface to access basic properties of an operator in the context of its coordinator. */
public interface OperatorInfo {

    OperatorID operatorId();

    int maxParallelism();

    int currentParallelism();

    // ------------------------------------------------------------------------
    //  utils
    // ------------------------------------------------------------------------

    static Collection<OperatorID> getIds(Collection<? extends OperatorInfo> infos) {
        return infos.stream().map(OperatorInfo::operatorId).collect(Collectors.toList());
    }
}
